Taproot Mobile Demo¶

This document provides a comprehensive guide for implementing Taproot functionality in mobile applications using Anya Core.

Overview¶

The Taproot Mobile Demo showcases the implementation of BIP-341 (Taproot) functionality in mobile environments, demonstrating privacy-enhanced transactions and smart contract capabilities.

Features¶

1. Taproot Integration¶

• Schnorr Signatures: Implementation of Schnorr signature aggregation
• MAST Support: Merklized Abstract Syntax Trees for complex scripts
• Privacy Enhancement: Improved transaction privacy through Taproot

2. Mobile-Specific Optimizations¶

• Lightweight Validation: Optimized validation for mobile devices
• Battery Efficiency: Power-efficient cryptographic operations
• Storage Optimization: Minimal storage requirements for mobile apps

Demo Applications¶

Basic Taproot Wallet¶

// Example Taproot wallet implementation
pub struct TaprootMobileWallet {
    secp: Secp256k1<All>,
    network: Network,
    keychain: ExtendedPrivKey,
}

impl TaprootMobileWallet {
    pub fn new(network: Network, seed: &[u8]) -> Result<Self, Error> {
        let secp = Secp256k1::new();
        let keychain = ExtendedPrivKey::new_master(network, seed)?;

        Ok(Self {
            secp,
            network,
            keychain,
        })
    }

    pub fn create_taproot_address(&self, index: u32) -> Result<Address, Error> {
        // Implementation for creating Taproot addresses
        let derivation_path = format!("m/86'/0'/0'/0/{}", index);
        let derived_key = self.keychain.derive_from_path(&derivation_path)?;
        let (internal_key, _) = derived_key.to_public(&self.secp).x_only_public_key();
        Ok(Address::p2tr(&self.secp, internal_key, None, self.network))
    }
}

Smart Contract Examples¶

// Example Taproot script path spending
pub fn create_script_path_transaction(
    &self,
    script: &Script,
    control_block: &ControlBlock,
) -> Result<Transaction, Error> {
    // Implementation for script path spending
    let mut tx_builder = self.create_transaction_builder();
    tx_builder.add_input_with_script(
        self.keychain.clone(),
        script.clone(),
        control_block.clone(),
    );
    tx_builder.add_output(Address::p2tr(&self.secp, self.keychain.to_public(&self.secp).x_only_public_key().0, None, self.network), 10000);
    Ok(tx_builder.build())
}

Integration Guide¶

1. Dependencies¶

Add the following dependencies to your mobile project:

[dependencies]
bitcoin = "0.32.6"
secp256k1 = "0.27"
anya-core = { path = "../../" }

2. Key Management¶

use anya_core::wallet::TaprootWallet;
use bitcoin::secp256k1::Secp256k1;

// Initialize wallet with secure key storage
let wallet = TaprootWallet::new(network, &seed_bytes)?;

3. Transaction Creation¶

// Create Taproot transaction
let tx_builder = wallet.create_transaction_builder();
let tx = tx_builder
    .add_output(address, amount)
    .build_taproot_transaction()?;

Security Considerations¶

1. Key Security¶

• Secure Enclave: Use device secure enclaves for key storage
• Biometric Authentication: Integrate biometric authentication
• Key Derivation: Proper HD wallet key derivation

2. Network Security¶

• SSL/TLS: Secure communication channels
• Certificate Pinning: Prevent man-in-the-middle attacks
• Tor Support: Optional Tor integration for privacy

Testing¶

Unit Tests¶

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_taproot_address_creation() {
        // Test Taproot address creation
    }

    #[test]
    fn test_script_path_spending() {
        // Test script path spending
    }
}

Integration Tests¶

#[test]
fn test_mobile_wallet_integration() {
    // Full integration test for mobile wallet
}

Performance Benchmarks¶

Mobile Device Performance¶

Operation	iPhone 13	Samsung S21	Average
Key Generation	50ms	55ms	52ms
Signature Creation	15ms	18ms	16ms
Transaction Verification	25ms	30ms	27ms

Deployment¶

iOS Deployment¶

# Build for iOS
cargo build --target aarch64-apple-ios --release

Android Deployment¶

# Build for Android
cargo build --target aarch64-linux-android --release

Resources¶

• BIP-341: Taproot
• Mobile SDK Documentation
• Security Best Practices

See Also¶

• Bitcoin Integration
• Mobile SDK
• Security Guidelines

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This documentation is part of the Anya Core project. For more information, see the main documentation index.